ROT18 implementation in python and c

rot18.c

void rot18(char *c)
{
    while (*c)
    {
        if (*c >= 'A' && *c <= 'Z')
            *c = ('A' + (*c - 'A' + 13) % 26);
        else if (*c >= 'a' && *c <= 'z')
            *c = ('a' + (*c - 'a' + 13) % 26);
        else if (*c >= '0' && *c <= '9')
            *c = ('0' + (*c - '0' + 5) % 10);
        c++;
    }
}

rot18.py

ROT18 = str.maketrans(
    "ABCDEFGHIJKLMabcdefghijklmNOPQRSTUVWXYZnopqrstuvwxyz0123456789",
    "NOPQRSTUVWXYZnopqrstuvwxyzABCDEFGHIJKLMabcdefghijklm5678901234",
)

def rot18(text):
    return text.translate(ROT18)